Feels like there is a business case for people willing to pay to reduce trip times for trans continental flights.
The problem is that the greenhouse gas impact will be higher for a supersonic trip compared to a subsonic one. This is on top of the issue that we don't really have a good low carbon alternative for longer range air travel (batteries don't have anywhere near enough specific energy). The best option we have is synthetic jet fuel produced from green electricity. Producing jet fuel that way is many times more expensive than fossil fuel jet fuel.
The problem is that the greenhouse gas impact will be higher for a supersonic trip compared to a subsonic one. This is on top of the issue that we don't really have a good low carbon alternative for longer range air travel (batteries don't have anywhere near enough specific energy). The best option we have is synthetic jet fuel produced from green electricity. Producing jet fuel that way is many times more expensive than fossil fuel jet fuel.